package com.atstudying.mallsearch.service.impl;

import com.alibaba.fastjson.JSON;
import com.atstudying.common.to.es.SkuEsModel;
import com.atstudying.mallsearch.config.MallESConfig;
import com.atstudying.mallsearch.constant.EsConstant;
import com.atstudying.mallsearch.service.MallSearchService;
import com.atstudying.mallsearch.vo.SearchParam;
import com.atstudying.mallsearch.vo.SearchResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author Mr.zhneg
 * @create 2020-11-04-22:52
 */
@Service("MallSearchService")
@Slf4j
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;
    @Override
    public SearchResult search(SearchParam param) throws IOException {
        //1：动态构建出查询需要的DSL语句
        SearchResult result=null;

        //1：准备检索请求
        SearchRequest searchRequest=new SearchRequest();
        searchRequest= buildSearchRequest(param);
        try {
            //2：执行检索请求
            SearchResponse response = client.search(searchRequest, MallESConfig.COMMON_OPTIONS);

            //3：分析响应数据封装成我们需要的格式
           result= buildSearchResult(response,param);
        }catch (IOException e){
            e.printStackTrace();
        }

        return result;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {

        SearchResult result = new SearchResult();
        //返回给所有查询到的商品
        SearchHits hits = response.getHits();

        List<SkuEsModel> esModels=new ArrayList<>();
        if(hits.getHits()!=null&&hits.getHits().length>0){
            for (SearchHit hit:hits.getHits()){
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(string);
                }
                esModels.add(skuEsModel);
            }
        }
        //1：返回的所有查询到的商品
        result.setProducts(esModels);

        //2：当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos=new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()){
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1：得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();

            //2：得到属性的名字
            String attr_name_agg = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();


            //3：得到属性的所有值
            List<String> attr_value_agg = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrName(attr_name_agg);
            attrVo.setAttrValue(attr_value_agg);
            attrVo.setAttrId(attrId);
            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);

        //3：当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos=new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket:brand_agg.getBuckets()){
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1：得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();

            //2：得到品牌的名字
            String brand_name_agg = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();

            //3：得到品牌的图片
            String brand_img_agg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();

            brandVo.setBrandImg(brand_img_agg);
            brandVo.setBrandName(brand_name_agg);
            brandVo.setBrandId(brandId);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        //4：当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");

        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        List<SearchResult.CatalogVo> catalogVos=new ArrayList<>();
        for (Terms.Bucket bucket:buckets){
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);

            catalogVos.add(catalogVo);
        }


        //5：分页信息-页码
        result.setPageNum(param.getPageNum());

        //5：分页信息-总记录数
        long total= hits.getTotalHits().value;
        result.setTotal(total);

        //5：分页信息-总页码
        int totalPage= (int) (total%EsConstant.PRODUCT_PAGESIZE==0?total/EsConstant.PRODUCT_PAGESIZE:(total/EsConstant.PRODUCT_PAGESIZE+1));

        result.setTotalPage(totalPage);
        String string = result.toString();
        List<Integer> pageNavs=new ArrayList<>();
        for (int i=1;i<totalPage;i++){
            pageNavs.add(i);
        }

        result.setPageNavs(pageNavs);
        System.out.println("响应的数据："+string);

        return result;
    }

    /**
     * 准备检索请求
     * 模糊匹配。过滤（按照属性，分类，品牌，架构区间，库存），排序，分页，高亮，聚合分析
     */
    private SearchRequest buildSearchRequest(SearchParam param){

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建DSL语句

        /**
         *   查询：模糊匹配。过滤（按照属性，三级分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
         */

        //1：构建bool -query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

        //1.1  must ——模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }

        //1.2 bool -filiter——按照三级分类id查询
        if (param.getCatalog3Id()!=null){
//            boolQuery.filter(QueryBuilders.termsQuery("catalogId",param.getCatalog3Id()));
            boolQuery.filter(QueryBuilders.termsQuery("catalogId",param.getCatalog3Id()));

        }
        //1.2 bool -filiter——按照品牌id查询
        if (param.getBrandId()!=null&&param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        //1.2 bool -filiter——按照属性查询
        if (param.getAttrs()!=null &&param.getAttrs().size()>0){

            //不断遍历循环
            //attrs=1_5寸:8寸&attrs=2_16G:8G
            for (String attrStr:param.getAttrs()){
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();

                //attrs=1_5寸:8寸
                String[] s = attrStr.split("_");
                String attrId=s[0];//检索属性id
                String[] attrValues=s[1].split(":");//这个属性的检索用的值
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrId",attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
               //每一个都必须生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);

            }


            }

        //1.2 bool -filiter——按照库存查询
        if (param.getHasStock()!=null){
            boolQuery.filter(QueryBuilders.termsQuery("hasStock",param.getHasStock()==1));

        }

        //1.2 bool -filiter——按照价格区间查询
        if(!StringUtils.isEmpty(param.getSkuPrice())){
            //1_500/_500/500_
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = param.getSkuPrice().split("_");
            if (s.length==2){
                //区间
                //大于前边的小于后边的
                rangeQuery.gte(s[0]).lte(s[1]);

            }else if (s.length==1){
                if (param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
        }
        //把以前的所有条件都拿来进行封装
        sourceBuilder.query(boolQuery);
        /**
         * 排序，分页，高亮，
         */

        //2.1 排序
        if (!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            //sort=hotScore_asc/desc
            String[] s = sort.split("_");
            SortOrder order=s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }
        //2.2 分页 pagesize=5
        //pageNum:1 from:0 size:5
        //pageNum:2 from:5 size:5
        //from=pageNum-1 *pagesize
        sourceBuilder.from(Math.toIntExact((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE));
        sourceBuilder.size(Math.toIntExact(EsConstant.PRODUCT_PAGESIZE));

        //2.3 高亮，
        if (!StringUtils.isEmpty(param.getKeyword())){

            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);

        }

        /**
         * 聚合分析
         */

        //1：todo 品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));

        sourceBuilder.aggregation(brand_agg);

        //2：todo 分类聚合catalog_agg
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(1);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));

        sourceBuilder.aggregation(catalog_agg);

        //3：todo 属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");

        //聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //聚合出当前所有的attrId对应的名字
        attr_id_agg.subAggregation( AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //聚合出当前所有的attrId对应的所有可呢属性值attrValue
        attr_id_agg.subAggregation( AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));

        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        String string = searchRequest.toString();
        System.out.println("检索DSL请求："+string);
        return searchRequest;
    }
}
